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hoa [83]
3 years ago
10

is there difference if you pull a block down a hill or if you push a block down a hill. Or if you push a block up a hill or pull

it up ? For example if you PULL a block down a hill it would be F+Fg||-fk =ma (the force you are using +Fsinθ - kinetic friction =ma. Would this change if you PUSH the block down? ​
Physics
1 answer:
Afina-wow [57]3 years ago
8 0

Answer:

Yes it will be changed

Explanation:

Lifting up requires potential energy while dropping down requires kinetic, both will have different equations

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A scientist adds different amounts of salt to 5 bottles of water. She then
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A. The time it takes for the water to boil.

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How fast and in what direction must galaxy A be moving 17 an absorption Line found at 500 nm for a stationary galaxy 1s shifted
emmainna [20.7K]

Answer:

v = 0.22 c and wavelength is decrease so galaxy A is move away from stationary galaxy

v = 0.095 c and wavelength is increase so galaxy B come toward stationary galaxy

Explanation:

Given data

found = 500 nm

shifted A = 400 nm

shifted B = 550 nm

to find out

How fast and in what direction is galaxy

solution

we use here formula  that is

(λ) shifted = √(1-β / 1+β)  (λ)found

1-β / 1+β =  (4/5)²         ..................1

1-β / 1+β =  16 / 25

β = 0.22

v/c = 0.22

v = 0.22 c

here wavelength is decrease so galaxy A is move away from stationary galaxy

and

here according to equation 1

and we use shifted 550 nm

so

1-β / 1+β =  (5.5/5)²

1-β / 1+β =  30.25 / 25

β = 0.095

so  v/c = 0.095

v = 0.095 c

here wavelength is increase so galaxy B come toward stationary galaxy

3 0
2 years ago
Every few years, winds in Boulder, Colorado, attain sustained speeds of 45.0 m/s (about 100 miles per hour) when the jet stream
emmainna [20.7K]

Answer:

271248.75 N

Explanation:

\rho = Density of air = 1.14 kg/m³

v = Velocity of wind = 45 m/s

A = Area = 235 m²

From Bernoulli's principle we have the relation

P_1-P_2=\frac{1}{2}\rho v^2\\\Rightarrow \Delta P=\frac{1}{2}1.14\times 45^2\\\Rightarrow \Delta P=1154.25\ Pa

Force is given by

F=PA\\\Rightarrow F=1154.25\times 235\\\Rightarrow F=271248.75\ N

Force due to the jet stream on the roof is 271248.75 N

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